A novel uranyl complex UO 2(tci)(C 3H 5N 2) · H 2O: Synthesis, crystal structure and characterization

• Published in: Inorganic chemistry communications Vol. 12; no. 2; pp. 86 - 88
• Main Authors: Liang, Lingling, Cai, Yige, Weng, Ng Seik, Zhang, Ronglan, Zhao, Jianshe, Wang, Jifeng, Wu, Hongling
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009
• Subjects: Crystal structure; Hydrothermal reaction; Uranium complex; Uranium complex; Hydrothermal reaction; Crystal structure
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2008.10.027

As a complicated complex, UO 2(tci)(C 3H 5N 2) · H 2O is prepared by uranyl ion and tciH 3 which contains three nitrogen atoms, three carbonyl groups and three propionic acid groups. Each uranium atom is located in a hexagonal bipyramidal environment, surrounded by eight oxygen atoms, six of which are in the equatorial plane and are from three carboxyl groups in bidentate coordination to the UO 2 2 + center. The remaining two oxygen atoms are terminal and occupy the two axial positions to complete the coordination sphere of the U(VI) center. Reaction of uranium oxynitrate hexahydrate with tris(2-carboxyethyl)isocyanurate (tciH 3) in acidic aqueous solution (pH ∼4–5) yields the compound UO 2(tci)(C 3H 5N 2) · H 2O. X-ray diffraction shows that the uranyl ion is in a hexagonal bipyramid structure. Uranium ion in the complex is found to be ligated with three chelating COO − groups at the equatorial plane, two oxygen atoms linking to uranium atom formed the vertical axis. The complex has the layered topology structure in the space. The thermal analysis verifies the component and the structure of the complex.